213231423 has 16 divisors (see below), whose sum is σ = 295142400. Its totient is φ = 136789440.

The previous prime is 213231397. The next prime is 213231427. The reversal of 213231423 is 324132312.

It is not a de Polignac number, because 213231423 - 2⁹ = 213230911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213231423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213231427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10243 + ... + 23051.

It is an arithmetic number, because the mean of its divisors is an integer number (18446400).

Almost surely, 2^213231423 is an apocalyptic number.

213231423 is a deficient number, since it is larger than the sum of its proper divisors (81910977).

213231423 is a wasteful number, since it uses less digits than its factorization.

213231423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13022.

The product of its digits is 864, while the sum is 21.

The square root of 213231423 is about 14602.4457882918. The cubic root of 213231423 is about 597.4254715839.

Adding to 213231423 its reverse (324132312), we get a palindrome (537363735).

The spelling of 213231423 in words is "two hundred thirteen million, two hundred thirty-one thousand, four hundred twenty-three".